cvedb.io
CVE-2025-6442
MEDIUM · CVSS 5.9
EPSS exploitation probability: 0%
Published 2025-06-25T17:15:40.117 · Last modified 2026-06-17T10:01:54.183

Summary

Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.

Affected products

ruby-lang — webrick

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.